OFDM Multiple Antennas Cognitive Radio Relay Synchronization CDMA Channel Estimation Spectrum Sharing Interference Cancellation Resource Allocation Spectrum Sensing Full duplex Neural Networks Stochastic Geometry Equalizer Feedback Bi-Directional Heterogeneous Networks Femtocell Energy Harvesting Device-to-Device (D2D) Cell Search Two-way communications automatic repeat request (ARQ) in-band full-duplex system transmission capacity (TC) sensing duration UWB Simultaneous Sensing and Transmission Correlated MIMO self-interference cancellation full-duplex cellular multi-spectral mode selection Handoff achievable sum rate outage probability bursty traffic model Cognitive relay networks selection diversity full-duplex relay FBMC Heterogeneous channel estimation capability Bi-directional full-duplex Vehicular and wireless technologies Spectral efficiency Channel estimation error Shortened TTI Latency Ultra-dense small cell Cellular networks Asynchronized system UL grant free NOMA LTE-TDD Iterative decoder Dynamic TDD HetNet Cross-link interference OQAM